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closest.js
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36 lines (28 loc) · 954 Bytes
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
// @flow
import createSimplePath, { type SimplePath } from "./simple-path";
import { traverseAst } from "./ast";
import { nodeContainsPosition } from "./contains";
import type { AstPosition } from "../types";
export function getClosestPath(
sourceId: string,
location: AstPosition
): SimplePath {
let closestPath = null;
traverseAst(sourceId, {
enter(node, ancestors) {
if (nodeContainsPosition(node, location)) {
const path = createSimplePath(ancestors);
if (path && (!closestPath || path.depth > closestPath.depth)) {
closestPath = path;
}
}
}
});
if (!closestPath) {
throw new Error("Assertion failure - This should always fine a path");
}
return closestPath;
}